Minimum wage work has been on the decline in the US for several years, and the number of workers making the minimum wage or less varies widely across the states.

The Bureau of Labour Statistics tracks how many people earned the Federal minimum wage or less in each state in a given year, releasing those results in an annual report on minimum wage earners.

The BLS bases its estimates on results from the Current Population Survey, a monthly survey run by the BLS and the Census Bureau that serves mainly as the basis for calculations of the unemployment rate, as well as providing a useful monthly snapshot of the US population.

That means that these estimates come from Americans’ own self-reported earnings on the survey, rather than from employers or government administrative sources.

Both the number and percentage of the hourly work force earning the minimum wage or lower has declined in recent years as the labour market continues to tighten. In 2015, about 2.6 million hourly workers in the US were paid at or below the minimum wage – about 3.3% of the hourly workforce. By 2017, that dropped to 1.8 million workers, or 2.3% of all hourly paid workers.

Here’s the percentage of hourly paid workers in each state who earned the federal minimum wage or less in 2017, according to the BLS’ report. It’s worth noting that many states have their own minimum wages that are set higher than the Federal minimum, and that this is likely a big driver in the variation among the states.